<p>Strong earthquakes continue to cause significant human and economic losses worldwide, emphasizing the critical need for effective seismic energy dissipation systems to improve structural resilience. A frictional damper (FD) is a widely used passive control device; however, most conventional designs operate with a single slip force, which limits their adaptability to earthquakes with different intensity levels. To address this limitation, this study proposes a novel frictional damper capable of providing two distinct slip-force levels, enabling staged energy dissipation under varying seismic demands. The mechanical behavior of the proposed damper is numerically investigated using Abaqus and OpenSees. Its effectiveness is evaluated through nonlinear time-history analyses of three structural configurations: a bare reinforced concrete frame, a frame equipped with a friction–rotational damper (FRD), and a frame incorporating the proposed frictional damper. The analyses are conducted under the design-level earthquake (DLE) and the maximum considered earthquake (MCE). Results show that while both damping systems perform similarly under the DLE, the proposed damper achieves superior performance under the MCE, reducing peak roof displacement by approximately 7–12% compared with the FRD. Furthermore, as seismic intensity increases, base shear rises by about 10% in the bare frame and 1% in the FRD system, whereas a 4% reduction is observed when the proposed damper is used. The novelty of this study lies in the development of a dual-slip frictional damper capable of adaptive energy dissipation under different seismic hazard levels. These results highlight the improved adaptability and seismic efficiency of the proposed device.</p>